| 4501 | Tejas Production Company | | Oil Operator | Nov 1979 |
| 4502 | Telico Minerals, L.L.C. | | Oil & Gas Operator | Oct 2019 |
| 4503 | Tellurian Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 4504 | Tellus Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 4505 | Tellus Operating Group, LLC | | Oil & Gas Operator | Mar 2025 |
| 4506 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 4507 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 4508 | Temex Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4509 | Tempest Oil Company, Inc. | | Oil & Gas Operator | Jul 1978 |
| 4510 | Templeton Energy Inc | | Oil & Gas Operator | Jul 1987 |
| 4511 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | May 2025 |
| 4512 | Tenneco Inc. | | Oil & Gas Operator | Jun 1989 |
| 4513 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Feb 2025 |
| 4514 | Tenneco Ventures Corporation | | Oil & Gas Operator | Feb 1996 |
| 4515 | Tennessee Gas Pipeline Company | | Oil & Gas Operator | Dec 2011 |
| 4516 | Tennessee Gas Pipeline Company, LLC | Houston, TX 77252 | Oil Operator | Dec 2024 |
| 4517 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 4518 | Tensas Delta Land Company | | Oil & Gas Operator | Apr 2002 |
| 4519 | Tensas Exploraton & Production Co LLC | | Oil & Gas Operator | Nov 2009 |
| 4520 | Tepco Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2004 |
| 4521 | Tepco, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 1999 |
| 4522 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 4523 | Termo Co. Of Texas | | Oil & Gas Operator | Dec 1986 |
| 4524 | Terra Resources, Inc. | Casper, WY 82601 | Oil & Gas Operator | Jun 1990 |
| 4525 | Terral D Hinds | | Oil Operator | Mar 2012 |
| 4526 | Terrier Oil Company | | Oil & Gas Operator | Feb 2015 |
| 4527 | Terronne Petroleum Corporation | | Oil & Gas Operator | Nov 2024 |
| 4528 | Terry Development, Inc. | | Oil & Gas Operator | Aug 1992 |
| 4529 | Terry Oil Company LLC | | Oil Operator | Dec 2024 |
| 4530 | Tervita, LLC | | Oil Operator | May 2021 |
| 4531 | Tesla Resources, Inc. | | Oil & Gas Operator | Aug 1996 |
| 4532 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 4533 | Tesoro Petroleum Corporation | | Oil & Gas Operator | May 1982 |
| 4534 | Tex-Con-Brehm-Basin Expl. | | Oil & Gas Operator | May 1990 |
| 4535 | Tex/Con Oil & Gas Company | Houston, TX 77074 | Oil & Gas Operator | Feb 2001 |
| 4536 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | May 2025 |
| 4537 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 4538 | Texaco Inc & A.C. Glassell Jr | | Oil & Gas Operator | Aug 1980 |
| 4539 | Texaco Oils, Inc. | Tulsa, OK 74102-2420 | Oil & Gas Operator | Jan 2003 |
| 4540 | Texaco Producing Inc. | Rock Springs, WY 82901 | Oil & Gas Operator | Dec 2000 |
| 4541 | Texada Resources, Inc. | | Oil & Gas Operator | Dec 1992 |
| 4542 | Texakoma Operating, L.P. | Plano, TX 75024 | Oil & Gas Operator | Jan 2025 |
| 4543 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | May 2025 |
| 4544 | Texas City Refining, Inc. | | Oil & Gas Operator | Nov 1988 |
| 4545 | Texas Crude & Dale Gas Expl | | Oil & Gas Operator | Dec 1984 |
| 4546 | Texas Crude Exploration, Inc. | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 1992 |
| 4547 | Texas Crude Oil Co. | | Oil & Gas Operator | Dec 1984 |
| 4548 | Texas Crude Oil Co. Et Al | | Oil & Gas Operator | May 1992 |
| 4549 | Texas Crude Oil, Inc. | | Oil & Gas Operator | Dec 1984 |
| 4550 | Texas Crude Operator, Inc. | Houston, TX 77098 | Oil & Gas Operator | Aug 2017 |
| 4551 | Texas Crude, Inc. | Houston, TX 77256 | Oil & Gas Operator | Oct 1995 |
| 4552 | Texas Crude-Rebstock & Reeves | | Oil & Gas Operator | Feb 1980 |
| 4553 | Texas Crude-Wainoco-Hilliard | | Oil & Gas Operator | Jul 1978 |
| 4554 | Texas Eastern Skyline Oil Co. | | Oil & Gas Operator | Jan 1987 |
| 4555 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 4556 | Texas Energy & Environmental Inc | Houston, TX 77269 | Oil & Gas Operator | Oct 1998 |
| 4557 | Texas Gas Exploration Corp. | | Oil & Gas Operator | Nov 1986 |
| 4558 | Texas Gas Transmission Corp. | | Oil Operator | Aug 2003 |
| 4559 | Texas Gas Transmission LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 4560 | Texas General Petroleum Corp | | Oil & Gas Operator | Aug 1984 |
| 4561 | Texas Ind. Exploration, Inc. | | Oil & Gas Operator | Oct 2001 |
| 4562 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 4563 | Texas Meridian Res. Expl., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 1998 |
| 4564 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4565 | Texas Pacific Oil Company Inc. | | Oil & Gas Operator | Dec 1980 |
| 4566 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 4567 | Texas T Oil Co. | | Oil & Gas Operator | Apr 1990 |
| 4568 | Texasgulf Inc. | Newgulf, TX 77462 | Oil & Gas Operator | Jul 1994 |
| 4569 | Texeast Operating Co., Inc. | Farmers BRNCH, TX 75234 | Oil Operator | May 2025 |
| 4570 | Texegy Operating Company LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 4571 | Texex Petroleum Corporation | | Oil & Gas Operator | Dec 2024 |
| 4572 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | May 2025 |
| 4573 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 4574 | Texoil Company | | Oil & Gas Operator | Dec 2000 |
| 4575 | Texoma Production Co | | Oil & Gas Operator | Jun 1986 |
| 4576 | Texona Petroleum Corporation | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 4577 | Texstar Petroleum, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2000 |
| 4578 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 4579 | TGX Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 2004 |
| 4580 | Tharp Operating Company | Houston, TX 77070 | Oil & Gas Operator | Nov 2014 |
| 4581 | The B&B Oil Co Of Sabine Inc | | Oil Operator | Jun 1982 |
| 4582 | The B&C Corp-Imp Amer MGT Co | | Oil & Gas Operator | Aug 1981 |
| 4583 | The Ballard & Cordell Corp | | Oil & Gas Operator | Feb 1982 |
| 4584 | The Bering Company | | Oil Operator | Jul 1979 |
| 4585 | The Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Jan 2025 |
| 4586 | The Cornell Corporation | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 1993 |
| 4587 | The Dow Chemical Company | | Oil & Gas Operator | Dec 1997 |
| 4588 | The Exploration Co. Of La, Inc | | Oil & Gas Operator | Nov 1987 |
| 4589 | The George R Brown Partnership | | Oil & Gas Operator | Jun 1992 |
| 4590 | The Goro Corporation | | Oil & Gas Operator | Jul 1978 |
| 4591 | The Harvest Group, LLC | | Oil & Gas Operator | May 2011 |
| 4592 | The Hunter Company, Inc. | | Oil & Gas Operator | Sep 1985 |
| 4593 | The Maurice L. Brown Company | | Oil & Gas Operator | Aug 1987 |
| 4594 | The Meridian Res. & Exp. LLC | | Oil & Gas Operator | Sep 2010 |
| 4595 | The Meridian Resource & Exp Co | | Oil & Gas Operator | Dec 2000 |
| 4596 | The Pioneer | | Gas Operator | Feb 2008 |
| 4597 | The Romanoff Corporation | | Oil & Gas Operator | Nov 1989 |
| 4598 | The Southern Louisiana Expl. Company LLC | | Oil & Gas Operator | Nov 2024 |
| 4599 | The Stone Oil Corporation | | Oil & Gas Operator | May 1985 |
| 4600 | The Stone Petro Corp-Toce Oil | | Oil & Gas Operator | Oct 1984 |